在石墨中有效的电子注入使可逆NaC2储存成为可能.
Shweta Choudhary1, Ritika Saroha1, Swastika Banerjee1
1Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India.
ACS applied materials & interfaces
|September 16, 2024
概括
石墨烯阳极具有高离子 (Na-ion) 储存能力,克服了石墨的局限性. 这种设计使电网存储应用中高效,可逆的Na-ion电池性能成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 计算化学计算化学
背景情况:
- 离子 (Na-ion) 电池正在探索作为电网存储的离子电池的替代品.
- 石墨阳极由于热力学和结构不稳定性而面临Na-ion存储的局限性.
研究的目的:
- 通过计算设计和评估石墨烯作为可逆Na-ion存储的新型阳极材料.
- 为了研究石墨烯的电子注入能力和离子储存性能.
主要方法:
- 石墨烯结构的计算设计和探索.
- 分析电子注入容量和Na-离子静电测量.
- 评估特定容量,开放电路电压和离子扩散率.
主要成果:
- 石墨烯具有很高的电子注入能力,每个烯分子有15个电子.
- 实现了大规模的Na-离子储存,高达NaC2静电测量,具有551 mAhg-1的特定容量.
- 由于增强的表面扩散性,证明了快速的Na-ion插入/提取动力学.
结论:
- 石墨烯是一种有前途的阳极材料,用于高容量,可逆的离子存储.
- 增加电子注入极限是先进碳阳极的可行策略.
- 这种方法避免了人造缺陷的引入或用于提高性能的兴奋剂.
相关概念视频
02:47Voltaic/Galvanic Cells
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
01:26Thermal and Photochemical Electrocyclic Reactions: Overview
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.